Thank you so much for the workaround. It works!
Thanks! I can't go to sleep because it's been bugging me.
Thank you very much. Your advice was really helpful!
I was starting to get an headache over this issue. Thanks!
Trying until I thought someone else must've had this problem.
Other:

This is NOT abusive. I pressed this button by accident.It is spam / self promotion.It is offensive or harmful.It does not contain enough information.It contains or requests illegal information.It does not make sense.

"Security having a look at authority certificates..."

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Dear user first of all Try checking in your Menu > Settings > Security having a look at Authority certificates or User certificates - to view the list of the authority or user certificates downloaded into your phone.

>>Also trying updating your phone`s firmware to the latest version using Nokia Suite here is the link below with a guide on how to update your software.

>>If it still doesn`t work you can do a hard reset (factory reset) by Selecting Menu > Settings > Rest. factory sett. (or Reset device or Restore factory sett. or Rest. fact. sett.).
> To reset only preference settings, but keep all personal data, such as contacts, messages and media file, select Restore settings only
> To reset all preference settings and delete all personal data, select Restore all

>Enter the security code before the restore. If you have never changed your security code, then enter the default code 12345.

"To your settings. look for the installation settings. then under software installation..."

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This is the certificate on your phone. You have to go to your Settings. Look for the Installation Settings. Then under Software Installation, instead of choosing Signed Only, you have to select ALL.
This will let you Signed and Unsigned Applications.

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When i install whatsapp on my phone it says certificate error not valid?

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